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Published online by Cambridge University Press: 03 December 2021
One important characteristic of all aerogels is their large specific surface area. Almost in every paper on aerogels, not only the envelope density is reported but also the specific surface area in terms of inner surface per unit mass. We first present some fundamental relations for the specific surface area of particulate aerogels, such as silica or RF aerogels, and fibrillar aerogels such as cellulose. We then define terms and present selected experimental results to compare the models with reality.Techniques to measure the surface area by nitrogen adsorption and the fundamental equations behind them such as the famous BET theory or the t-plot method are derived and compared with experimental results.
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